Remove unused method and field from DartSdkManager

pkg/analysis_server/test/domain_server_test.dart

Index: pkg/analysis_server/test/domain_server_test.dart
diff --git a/pkg/analysis_server/test/domain_server_test.dart b/pkg/analysis_server/test/domain_server_test.dart
index b6091e1530068265058291c7ee04e54ade5f5a6a..4fbb2b0e97859bfb5937693ed7e04f9c10469efa 100644
--- a/pkg/analysis_server/test/domain_server_test.dart
+++ b/pkg/analysis_server/test/domain_server_test.dart
@@ -15,14 +15,12 @@ import 'package:analyzer/src/generated/sdk.dart';
 import 'package:plugin/manager.dart';
 import 'package:test/test.dart';
 
-import 'mock_sdk.dart';
 import 'mocks.dart';
 
 main() {
   AnalysisServer server;
   ServerDomainHandler handler;
 
-
   setUp(() {
     var serverChannel = new MockServerChannel();
     var resourceProvider = new MemoryResourceProvider();
@@ -36,7 +34,7 @@ main() {
         null,
         serverPlugin,
         new AnalysisServerOptions(),
-        new DartSdkManager('', false, (_) => new MockSdk()),
+        new DartSdkManager('', false),
         InstrumentationService.NULL_SERVICE);
     handler = new ServerDomainHandler(server);
   });